Process for the production of photographic plates, films, and the like for indirect three-color photography



Septn 4, 1928.

A. LAGE PROCESS FOR THE PRODUCTION OF PHOTOGRAPHIC PLATES, FILMS,

OR INDIRECT THREE-COLOR PHOTOGRAPHY Filed March 13, 1926 AND THE LIKE F IN VEN TOR.

ATTQRNEY.

Patented Sept. 4, 1928.

UNITED STATES l, 1,683,560 PATENT oFFlcE.

ERNST AUGUST LAGE, F WANDSBEX,I NEAR HAMBURG, GERMANY.

Y PROCESS FOB THE PRODUCTION OF PHOTOGRAPHIO PLATES, FILMS, AND THE LIKE FOR INDIRECT THREE-COLOR PHOTOGRAPHY,

Application led March 13, 1926, Serial No. 94,595, and in Germany October 23, 1925.

The invention relates to a process for the production of photographic plates, films and thelike for indirect three-color photography.

The invention consists principally in squeegeeing a light-sensitive film which is provided with a suitable coating of .emulslon for the red partial image on to a support provided with a suitable coating ot emulsion for the blue partial image and then pouring a l0 suitable coating of emulsion for the yellow partial image on to the film which has been squeegeed on to the support,

After a photographic exposure has been made the said film together with thecoating of emulsion which has been poured on can be strip d of! from the said support, after which t e two se arat'ed parts can be individually develo whereupon, after the film which has been stripped of has dried, the one or the other or both of the negatives can be separated from the film.

In the accompanying drawing, Figure 1 is an elevation and Figure 2 a side view of the means for pressing the films upon-the plate.

Fi re 3 is a sectional view through a plate with the layers in sitionthereon.

Fi 4 is a view slmilar to Figure 3, showmg the layers partly separated.

The process of production is carried out as follows Y .c

A iilm d, one side of which is coated with light-sensitive emulsion c and which, after the photographic exposure, is to provide the red partial image is squeegeed in such a -manner on to a lphotographical support a (dry plate, film or the like) coated-with an emulsion b which is to provide the blue part picture that the surface of the one emulsion coat-- ing c rests upon the surface of the other emulsion coating b and is in optical contact with the latter. The film d, together with the plate a, are pressed against one another b y one or more spring-actuated or yielding rubber rollers or the like which express the air between the layers band o which are to be -brought together. The rollers f, f are movable and rotatably mounted in th; lstandards e o' tbrou hblocks ,g rings eing proto iglormally gforfiespthe. rollers apart and screws iY providing an adjustment for obtaining the necessary pressure to the rolllers on the lilms passing therethrough, and beingforced into intimate contact. han- .55 dle lc mounted on one side at the extended ends of the lower rollershaft, provides the ,means for rotating the rollers and feeding the films b and c that are to be pressed together through the machine. An emulsion o, which after photographic exposure isintended to provide the yellow Partial image is now poured on to the still unused surface of the lm which has been squeegeed on to the support a.v Bymeans of this process an absolutely firm intimate contact of the individual parts with one another is attained which thus obviates for an indefinite period the possibility of the parts becoming automatically detached from' one another. After the photographicexposure Va slight incision is made on one or more of the edges of the plate or film in order to render possiblethe removal of the film which has been squeegeed on and which is coated on both sides with emulsion. After'the separation of the film from the support both parts are developed so that the glass plate, film or the likel after drying is at once suitable for providing the blue partial image, whilst, after the dryingo of the developed film, the coating of emulsion which was poured on is stripped o so that the film now forms the negative for the red partial image and the drawn-oil? coating the negative for the yellow partial image.

Instead of stripping the yellow partial negative off from the lm after its removal from the support the red partial negative may be stripped off or, if desired, both partial negatives mayy be stripped off. In the last named case the somewhat faulty transparency to light of the support for the coatings is thus overcome.

Besides this it is possible to print copies without removing one `of the coatings from the film after separation .from the support by bleaching one or the other of the partial images (thus rendering ittransparent) and afterwards causing the bleached image to reappear. r

lrProcess for the productiony of photographic tri-packs for indirect three-color photography, consisting in that a light-sensitive film provided with the coating of emulsionsuitable for1 they red partial image is 105 squeegeed on to a support provided with a coating of emulsion suitable for the blue partial image, after which a suitable coating of emulsion for the yellow artial image is poured on to the squeegeed m.

2. A process involving the exposure of a ing with the emulsion which has been poured photographie tri-pack of a type wherein a on from the sup ort, developing the support light sensitive film provided with an emuland emulsion aus the film and emulsions, and sion for a one-color image is squeegeed onto a separating one or the other of' the emulsions 5 Support previously provided with an emulfIOlIl the lm t0 thereby pIOVlde the desired 15 sion for another color image, with an emulnumber of negatives each having its indesion for a third-color image subsequently pendent color partial image. poured onto the squeegeed film, said process In testimony whereof I have aixed my further consisting in removing the film folsignature.

l0 lowing said exposure, together with the coat- ERNST AUGUST LAGE. 

